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Error code reference

GE Refrigerator Error Code F708

COM wrong version; COM version is not compatible with the ACM.

GE codesGE refrigerator codes

COM wrong version; COM version is not compatible with the ACM.

First step from the service manual

Check COM module version compatibility.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What F708 means on a GE refrigerator

The F708 error code on a GE refrigerator indicates a version compatibility conflict between the COM (communications) module and the ACM (appliance control module). These two control boards must be running firmware versions that are designed to work together. When the refrigerator's internal handshake process detects that the COM module's software version does not match what the ACM expects, it logs F708 and may limit or disable certain functions that depend on inter-board communication.

This mismatch typically surfaces after a control board replacement where the new part carries a different firmware revision than the existing module in the appliance. It can also appear after a failed or interrupted firmware update, which leaves one module updated and the other at its previous version. In some cases, a newly manufactured replacement COM module may carry a later firmware version that is simply not backward compatible with an older ACM already installed in the unit.

Diagnosing F708 starts by confirming the firmware or hardware revision printed on both the COM module and the ACM, then cross-referencing those versions to determine compatibility. If the versions are mismatched, the resolution is usually replacing one of the boards with a unit carrying a compatible version, or in some cases performing a firmware update if that capability is supported. Simply resetting the refrigerator will not resolve a true version incompatibility, as the conflict is rooted in the hardware and firmware present in the unit.

Source: manufacturer service documentation.

Common causes of F708

  1. 01

    Incompatible replacement COM module installed

    Part replacement

    If the COM module was recently replaced, the new part may carry a firmware version that is not compatible with the existing ACM. Checking the revision labels on both boards will confirm whether a mismatch exists.

  2. 02

    Incompatible replacement ACM installed

    Part replacement

    Similarly, a newly installed ACM may expect a COM module firmware version that the current COM module does not have. Comparing board revision numbers will identify this scenario.

  3. 03

    Failed or interrupted firmware update

    Wiring / connection

    If a firmware update was attempted and did not complete successfully, one module may have been updated while the other remained on the older version. This leaves the two boards out of sync with each other.

  4. 04

    Corrupted COM module firmware

    Part replacement

    Internal firmware corruption on the COM module can cause it to report an incorrect or unrecognized version to the ACM. The board may need to be replaced if the firmware cannot be restored.

See the test procedure for each cause

Frequently asked questions about F708

What does F708 mean on a GE refrigerator?
F708 means the COM module installed in the refrigerator is running a firmware version that is not compatible with the ACM (appliance control module). These two boards must operate on matching or mutually supported versions in order to communicate correctly. When the system detects this mismatch during its internal handshake process, it logs F708. Resolving it requires confirming the version of each board and replacing or updating the incompatible one.
Can I fix the F708 error myself without calling a technician?
This error generally requires comparing the firmware or hardware revision labels on both the COM module and the ACM, which involves accessing internal components. Unless you are comfortable working with refrigerator control boards and can source the correct compatible part, a qualified appliance technician is the safer option. Ordering the wrong replacement board can result in the same incompatibility error recurring.
Will resetting my GE refrigerator clear the F708 error?
A reset will not clear the F708 error if a genuine version incompatibility exists between the COM module and the ACM. Because the conflict is based on the firmware versions physically present in each board, the error will return as soon as the refrigerator runs its startup communication check. The underlying mismatch must be corrected before the code will go away.
Is the F708 error on a GE refrigerator a safety concern?
F708 is a communication compatibility fault rather than a safety-critical warning like an overtemperature or electrical fault. However, the incompatibility between the COM module and ACM can limit or disable features that depend on inter-board communication, which may affect temperature regulation or other functions. It is best to address the error promptly to ensure the refrigerator is operating fully and correctly.
How much does it cost to fix a GE refrigerator F708 error?
Repair costs depend on which board needs to be replaced. A replacement COM module or ACM for a GE refrigerator typically ranges from around $75 to $250 or more for the part alone, depending on the model. Adding professional labor, the total repair cost generally falls somewhere between $150 and $400. Getting a diagnosis first helps confirm which specific component is causing the incompatibility before purchasing parts.

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